Last Night's Look: Hit or Miss?

Vote on this week's styles including Gwen Stefani, Charlize Theron and more stars! You decide – are they fashionistas or flops?

SIENNA MILLER

She was applauded for her onstage good looks, and offstage Sienna continues to shine in a metallic cut-out minidress at the opening-night party for her Broadway play After Miss Julie.

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